WO2016066621A1 - Procédé et dispositif de production de produits semi-finis en fibres de carbone - Google Patents

Procédé et dispositif de production de produits semi-finis en fibres de carbone Download PDF

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Publication number
WO2016066621A1
WO2016066621A1 PCT/EP2015/074822 EP2015074822W WO2016066621A1 WO 2016066621 A1 WO2016066621 A1 WO 2016066621A1 EP 2015074822 W EP2015074822 W EP 2015074822W WO 2016066621 A1 WO2016066621 A1 WO 2016066621A1
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Prior art keywords
carbon fiber
carbon
vortex
fibers
region
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PCT/EP2015/074822
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German (de)
English (en)
Inventor
Chokri Cherif
Rolf-Dieter Hund
Anwar ABDKADER
Stefan TREICHEL
Original Assignee
Basf Se
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Publication of WO2016066621A1 publication Critical patent/WO2016066621A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G9/00—Opening or cleaning fibres, e.g. scutching cotton
    • D01G9/08—Opening or cleaning fibres, e.g. scutching cotton by means of air draught arrangements
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4242—Carbon fibres

Definitions

  • the present invention relates to a method and apparatus for producing carbon fiber semi-finished carbon fiber fabrics.
  • Another object of the invention is a carbon fiber tape obtainable by the method and its use. STATE OF THE ART
  • carbon fiber wefts and / or flakes are processed by a carding process and provided as a card sliver.
  • the purpose of the carding process is the dissolution of the carbon fiber wefts and / or flakes into individual fibers or fiber bundles and their orientation along the fiber axis.
  • the fibers are largely oriented and are suitable for further processing up to the desired end product.
  • DE 10 2009 023 529 describes a process for the recycling of fiber composite waste from unimpregnated carbon fibers, in which the fiber composite waste is cut up and disrupted by impactors. The resulting fiber worms are then restructured into fiber webs or webs.
  • the composite waste is processed in the described method under a high mechanical load into fiber entanglements.
  • WO 201 1/134995 describes a hybrid yarn for the production of molded parts which consists of a core of rectilinear staple fibers and a sheath of staple fibers wound around the core.
  • the staple fibers each consist of reinforcing fibers embedded in a thermoplastic matrix.
  • WO 2012/000827 describes a method for producing a sewing thread from carbon fiber materials.
  • the fibers of the sewing thread described are staple fibers of finite length of stretch-shredded or cut multifilament yarns which are spun together to form a yarn and coated or impregnated. From WO 201 1/095826 a spun yarn of recycled carbon fibers is known.
  • the recycled carbon fibers can come from different sources and are obtained by cutting a recycled carbon fiber material.
  • the process described comprises separating, digesting, blending, and spinning the carbon fibers into a yarn.
  • EP 1 854 91 1 A1 describes a hybrid carbon fiber spun yarn having a core region and an outer region enclosing the core region. In the core area, at least 20% by mass of the fibers are "long" carbon fibers with a length of 500 mm or more and in the outer region at least 80% by mass of the fibers are “short” carbon fibers with a fiber length of less than 500 mm.
  • EP 1 696 057 describes a method for the production of a carbon fiber tape in which a pitch-based, pitch-based carbon fiber with an aligned fiber profile is used as the starting point.
  • the obtained carbon fiber ribbon is pulled and twisted to obtain a carbon fiber spun yarn having 50 to 400 primary twist / m and at least 3 wt% of fibers having a fiber length of at least 150 mm.
  • Carbon fibers also known as carbon fibers, are industrially produced fibers from carbonaceous organic feedstocks that are converted to graphitic carbon by pyrolysis. It is possible to distinguish isotropic and anisotropic types of carbon fibers.
  • the isotropic carbon fibers have only low strengths and less technical importance. Due to their chemical structure, the anisotropic carbon fibers show high strengths and stiffnesses with low elongation at break in the axial direction and are of great industrial importance. Due to these properties, carbon fibers are only extensible to a very small extent and are also susceptible to forces acting transversely to the fiber longitudinal axis.
  • Processes known in the prior art for the production of carbon fiber semifinished products therefore usually lead to a significant reduction in the average fiber length and to loss of strength due to the process.
  • Known processes for the production of carbon fiber semi-finished products usually describe production processes of staple fibers.
  • the known methods often have the disadvantage that they lead to a reduction of the mechanical properties of the individual fibers.
  • the fibers experience high rates of acceleration and / or high stress due to shear and deflection forces, which results, for example, in a considerable reduction in the mean fiber lengths and thus reduced strength properties.
  • a fiber-sparing preparation of carbon fiber worms is to be made available in which the structural and mechanical properties of the processed carbon fibers are preserved or only slightly damaged.
  • the average fiber length of the carbon fibers should be largely retained from the carbon fiber entanglements used.
  • the method should be procedurally simple to implement and with little structural effort.
  • carbon fiber worms can be separated in a technologically simple manner in a turbulent air stream into fiber bundles or individual fibers.
  • the carbon fibers separated in this way can be deposited into a band with a high degree of orientation of the individual fibers or fiber bundles in the fiber longitudinal direction.
  • a fiber band produced in this way can be subjected to a suitable binding agent and thus solidified for the purpose of fixing or connecting separated individual fibers to one another.
  • a sliver produced in this way can be profiled or shaped and provided for further processing steps.
  • this object is achieved by a process for the preparation of fiber entanglements for the production of carbon fiber semifinished products, which comprises the following steps: a) provision of fiber entanglements at least containing carbon fibers and / or carbon fiber bundles in a vortex region; b) at least partially separating the fiber webs in a turbulent flow in the vortex region to obtain isolated carbon fibers and / or carbon fiber bundles;
  • step d) discharging the isolated and / or fractionated in step c) carbon fibers and / or carbon fiber bundles from the swirl region in an alignment region.
  • the semi-finished carbon fiber products are obtained in or subsequent to step d).
  • processing means a recycling process by recycling for the reuse of Fasergewirren be processed in the defined waste streams or parts of Fasergewirren to recover from it again marketable secondary raw materials.
  • the intention is to exclude the use of energy as well as the processing into materials which are intended for use as fuel or for refueling.
  • fiber structures are understood to mean flat or spatial structures, such as scrims, woven fabrics, braids, knitted fabrics, knitted fabrics, flakes and any combination thereof.
  • the fiber wovens to be used according to the invention contain carbon fiber constituents of generally at least 1% by weight, for example in the range from 1 to 100% by weight, preferably at least 5% by weight, for example in the range from 5 to 100% by weight. , particularly preferably at least 10 wt .-%, for example in the range of 10 to 100 wt .-%, in particular at least 15 wt .-%, for example in the range of 15 to
  • carbon fiber semifinished products are band, line and / or thread-like structures made of carbon fibers.
  • the semi-finished carbon fiber products are obtained in or following step d).
  • they may be subjected to a fabrication in one or more further steps.
  • carbon fiber semi-finished products obtained in accordance with the invention contain carbon fiber constituents of at least 50% by weight, for example in the range from 50 to 100% by weight, more preferably
  • Yo for example in the range of 60 to 100 wt .-%, especially preferably at least 75% by weight, for example in the range of 75 to
  • carbon fibers here and hereinafter also referred to as carbon fibers
  • carbon fibers are understood as meaning industrially produced fibers from carbon-containing organic starting materials which are converted, for example, by pyrolysis into graphitically arranged carbon. It may be both isotropic and anisotropic types of carbon fibers.
  • the isotropic carbon fibers have comparatively low strengths.
  • the anisotropic carbon fibers however, have due to their chemical structure high strength and stiffness with low elongation at break in the axial direction.
  • At least partially anisotropic carbon fibers are preferably used in the context of the present invention.
  • the carbon fibers used in the context of the present invention generally have a diameter in the micrometer range, for example in the range from 1 to 100 ⁇ m, preferably in the range from 2 to 50 ⁇ m, in particular in the range from 5 to 10 ⁇ m.
  • a carbon fiber bundle is understood to mean a bundle composed of carbon fibers.
  • a carbon fiber bundle may also comprise fibers other than carbon fibers.
  • such a carbon fiber bundle consists of 10 to 400,000 individual fibers, preferably from 10 to 100,000 individual fibers, in particular from 100 to 10,000 individual fibers.
  • fractionated carbon fibers or carbon fiber bundles are understood as meaning individual fibers or fiber bundles which are separated from a fiber tangle and have different properties, such as geometric dimensions, in particular length, diameter, area, shape, such as density, such as flow resistance, such as composition, etc., separated and optionally separated from impurities.
  • a vortex region is understood as meaning an area of a device or a device in which a fluid is fluidized.
  • vortex swirling is non-invasive in a highly turbulent flow.
  • the berries occur in the turbulence.
  • the turbulent Flow is characterized by mostly three-dimensional, seemingly random, unsteady movements of fluid particles.
  • the fluctuation movement leads to increased diffusion, which is several orders of magnitude greater than the molecular diffusion.
  • air classification means the fractionation of the carbon fibers and / or carbon fiber bundles according to their geometric dimensions.
  • alignment region is understood as meaning a region of a device and / or device for increasing the orientation of the fibers in their longitudinal direction.
  • the method according to the invention additionally comprises at least one of the following steps: e) aligning the carbon fibers and / or carbon fiber bundles discharged in step direction in the flow direction of a laminar flow in the alignment region, wherein the carbon fibers and / or carbon fiber bundles are stretched along their longitudinal axis;
  • step f) outflow of the carbon fibers and / or carbon fiber bundles discharged in step d) and optionally aligned in step e) in the direction of flow of the laminar flow;
  • step g) depositing the effluent carbon fibers and / or carbon fiber bundles discharged in step d) and optionally in step e) in the flow direction of the laminar flow and / or optionally obtained in step f) as a carbon fiber strip in a deposition area.
  • a laminar flow is understood to mean a movement of liquids and gases in which no visible turbulences, such as swirling or crossflows, occur. Liquids and gases are referred to here and below as fluids.
  • the fluid flows in laminar flow in layers that do not mix with each other. At a constant flow rate, a laminar flow is usually a steady state flow.
  • a strip-shaped fabric or scrim made of isolated fibers with a limited width and one under a carbon fiber tape
  • the term "deposit area” is understood to mean a region of a device and / or device for the uniform collection of singulated carbon fibers and / or carbon fiber bundles.
  • the carbon fibers are oriented in particular uniformly in their longitudinal direction.
  • the process according to the invention comprises at least one of the following steps: h) layer formation of the carbon fiber ribbon obtained in step g);
  • step g) application of at least one binder to at least partial areas of the carbon fiber strip obtained in step g) with an application device to form a carbon fiber strip which is selectively and / or wetted at least partially with the at least one binding agent;
  • step j profiling of the carbon fiber band obtained in step j), at least in some areas with the at least one binder selectively and / or wetted surface;
  • Carbon fiber tape and or
  • step g) applying a size to at least portions of the carbon fiber tape obtained in step g) with an applicator.
  • layering is understood to mean the stacking, in particular superimposition, unification of several carbon fiber ribbons.
  • profiling is understood to mean a shaping step.
  • the carbon fiber tape is passed through a device with a suitable profile tool, wherein the desired cross-sectional profile of the carbon fiber tape is configured.
  • the profiling may additionally comprise a surface treatment.
  • binder is understood to mean an additive and / or a composition for fixing the geometric arrangement of carbon fiber ribbons and their constituents, in particular filament geometries.
  • fixing is understood in particular to be the thermal solidification of a binder applied to carbon fiber ribbons and their constituents.
  • point and / or surface wetted carbon fiber ribbons are understood as meaning the application of binders to a profiled carbon fiber tape.
  • sizing is understood as meaning the application of sizing agents and / or sizing compositions to profiled and fixed carbon fiber ribbons.
  • the turbulent flow in the vortex region is generated pneumatically in step b).
  • the turbulent flow in the vortex region is generated in step b) by means of static and / or dynamic vortex elements arranged in the vortex region.
  • a whirl element is generally understood to mean a device which causes swirling of the fluid flow, here and hereinafter also referred to as whirl.
  • Vortexes can be forced by static vortex elements as well as by dynamic vortex elements.
  • static vortex elements are here and below rigid or stationary solids, which are flowed around by a fluid to be understood.
  • static vortex elements are all types of fixed baffles.
  • dynamic vortex elements here and below moving devices, which in turn make a fluid in motion, to be understood.
  • dynamic vortex elements are all types of stirrers.
  • the turbulent flow in the vortex region in step b) with compressed air in a range of 0.1 to 3 MPa absolute, preferably in a range of 0.15 to 2 MPa absolute, more preferably in a range of 0.2 to 1 MPa produced absolutely.
  • the turbulent flow in the vortex region in step b) is characterized by a Reynolds number greater than 1200.
  • the Reynolds number here and hereafter also referred to as Re-number or simply as Re, is a dimensionless index which represents the ratio of inertial to ductile forces.
  • the turbulence behavior of geometrically similar bodies is the same for a corresponding Reynolds number.
  • the characteristic length also referred to as reference length, can in principle be chosen freely. When comparing two flows, however, this length must be the same type.
  • the clear diameter of the pipe is chosen as the reference length. If the Reynolds number exceeds a system-dependent critical value Recrit, a laminar flow until then becomes susceptible to minute disturbances. Accordingly, Re> Rekrit is expected to undergo a shift from laminar to turbulent flow.
  • the turbulent flow in the vortex region in step b) is a stationary flow, a discontinuous flow, a pulsating flow and / or an alternating combination thereof.
  • a stationary flow is understood here and below to mean a flow without significant temporal change of the flow state.
  • a discontinuous flow is understood here and below as meaning a flow which undergoes a discontinuous, jerky and / or abrupt change in the flow state with respect to the time or the location.
  • a pulsating flow is understood as meaning a continuous, transient flow in which the speed and the position change periodically.
  • Periodic transient flow If the frequency of the state changes is sufficiently small, it can be treated as quasi-stationary, since the same averaged flow state exists at any given time as with a stationary flow.
  • the laminar flow in the alignment region in step e) is characterized by a Reynolds number in the range of 10 to 1200.
  • an alignment region is understood as meaning a region of a device and / or device for increasing the orientation of the fibers in their longitudinal direction.
  • the increase in the orientation of the fibers in their longitudinal direction in an alignment region is improved with a reduction in fluid velocity and the formation of a laminar flow.
  • the deposition area in step g) is subjected to a force field.
  • the force field generation is selected from a negative pressure, an electric field, a magnetic field, an adhesive force, combinations thereof.
  • the deposition area in step g) is subjected to a vacuum in a range of 50 to 70 hPa absolute.
  • the depositing area in step g) is subjected to an electrical voltage of more than 15 kV.
  • no torsional force is exerted on the effluent carbon fibers and / or carbon fiber bundles obtained in step f) and / or the carbon fiber strip obtained in step g).
  • torsional force is understood to mean a force for the twisting of a carbon fiber band along the longitudinal extension axis.
  • the layer formation in step h) is carried out with a winding device which coincides in a direction coincident with the longitudinal axis of the carbon fiber strip obtained in step g), forming the layer formation in step h) with its own longitudinal axis.
  • a winding device is understood to mean a device for winding up a carbon fiber tape.
  • the take-up device is a vacuum-loaded drum with a perforated surface onto which a carbon fiber tape is wound.
  • the carbon fiber tape after profiling in step i) and / or in step k), has a cross-sectional profile according to the geometric shape of the profiling tool.
  • a profiling tool is understood to mean a tool giving shape to the carbon fiber tape.
  • the carbon fiber tape has a cross section with an oval, in particular an elliptical or round, a triangular, a quadrangular, in particular a rectangular or square, a regular polygonal shape or any combination of said forms.
  • Particularly suitable are convex cross-sectional shapes or a combination of two or more convex cross-sectional shapes to a non-convex inner cross-section, such as an angular or a T-profile.
  • non-convex cross-sections in curved or round shape such as a sickle or annular cross-section.
  • the method according to the invention comprises at least step j) in addition to step g).
  • the application of the at least one binder in step j) is carried out by one of the method selected from dipping, sumping, immersing, spraying, impregnating, sprinkling, coating, curtain coating, transfer roll application, combinations thereof.
  • the invention also provides a device for the treatment of Fasergewirren for the production of semi-finished carbon fiber products, the len vortex container; - At least one vertebral container inlet;
  • the alignment element is arranged downstream of the at least one vortex container outlet in the outflow direction;
  • At least one outflow wherein the outflow is arranged in the outlet flow direction after the at least one alignment element comprises.
  • the outflow is designed such that the clear diameter is greater at its inlet than at its outlet.
  • a vortex container is understood as meaning a mixing device which essentially comprises a container, a vessel or a chamber in which a fluid is fluidized.
  • swirling in the spinal area is non-invasive.
  • vortex container inlet is understood to mean a device and / or device for supplying at least partially unaccelerated fiber entangling.
  • fiber wovens for the production of carbon fiber semi-finished products can be processed in a particularly gentle way.
  • the carbon fibers or carbon fiber bundles are the carbon fibers or carbon fiber bundles
  • vortex container outlet is understood to mean an apparatus and / or device for a discharge of at least partially separated fiber entanglements, in particular singulated carbon fibers and / or carbon fiber bundles.
  • a vortex container outlet is configured as a diaphragm.
  • an alignment element is a fabric of carbon fibers and / or carbon fiber bundles along its length Longitudinal axis understood.
  • the alignment element can be traversed by carbon fibers and / or carbon fiber bundles and has a longitudinal axis and a clear diameter.
  • the alignment element is a tube.
  • an outflow element is understood to be a device and / or device for a discharge of at least partially separated fiber worms, in particular singulated carbon fibers and / or carbon fiber bundles, which is arranged downstream of the discharge element.
  • an outflow element is designed as an outlet nozzle, a diffuser and combinations thereof.
  • the device according to the invention additionally comprises at least one of the following components: at least one removal device with a deposit area;
  • At least a second profile tool which is arranged after the at least one application device
  • the device according to the invention is characterized in that the at least one alignment element and / or the at least one outflow element is selected from a pipe, a pipe, a hose or combinations thereof.
  • the device according to the invention is characterized in that the at least one vortex container outlet is selected from a venturi, an orifice, a bore, a flap, a tube constriction, a valve, a slide, a diffuser, or combinations thereof.
  • the device according to the invention is characterized in that the ratio of the clear diameter of the alignment element to the clear diameter at the outlet of the discharge element is in the range of 1: 1 to 1:50.
  • the device according to the invention is characterized in that the at least one outflow element is selected from a conically tapered tube, a nozzle, a tube constriction or combinations thereof.
  • the device according to the invention is characterized in that the at least one removal device is a take-up device, a rotating drum, a movable belt or a combination thereof.
  • the device according to the invention is characterized in that the depositing area has a perforated surface.
  • a perforated surface is understood as meaning a surface which is permeable to fluid media at least in some areas.
  • a perforated surface may be configured as perforated with slots, holes and combinations thereof.
  • the device according to the invention is characterized in that the at least one first and / or second profile tool has an inner cross section with a point or axisymmetric geometry or a combination of two or more identical or different point or axisymmetric geometries.
  • the inner cross section of the respective profile tool has an oval, in particular an elliptical or round, a triangular, a quadrangular, in particular a rectangular or square, a regular polygonal shape or any combination of said shapes.
  • Particularly suitable are convex cross-sectional shapes or a combination of two or more convex cross-sectional shapes to a non-convex inner cross-section, such as an angular or a T-profile.
  • non-convex internal cross-sectional profiles in a curved or round shape such as a sickle-shaped or annular inner cross-section.
  • the device according to the invention is characterized in that the at least one application device consists of an immersion bath, a spray applicator, an impregnation Device, a spreading device, a coating device, a curtain applicator, transfer roller or combinations thereof.
  • the device according to the invention is characterized in that the at least one fixing device is selected from a calender, a press, a forming roll, a thermal fixing device, a radiation dryer, a radiation hardener, a thermal dryer or combinations thereof.
  • the invention further relates to a carbon fiber tape which is obtainable by a process according to the invention and / or produced in a device according to the invention.
  • the carbon fiber tape according to the invention is a ribbon-shaped or thread-shaped carbon fiber yarn which is fixed, for example, bebindert or sizing.
  • the carbon fibers and / or carbon fiber bundles are arranged unidirectionally.
  • the carbon fibers and / or carbon fiber bundles can be arranged at least partially offset from one another.
  • the carbon fibers and / or carbon fiber bundles may additionally or alternatively be arranged at least partially overlapping one another. For this purpose, punctiform and / or planar bonding regions are then formed between two and / or more carbon fibers and / or carbon fiber bundles.
  • the invention also provides the use of a carbon fiber tape which is obtainable by a process according to the invention and / or produced in a device according to the invention. It is used in particular for the manufacture of lightweight components for the aerospace and / or automotive industry and / or in mechanical engineering, for further processing in weaving processes, laying processes, in particular for the production of carbon fibers, woven fabrics, braids, knitted fabrics, knitted fabrics, carbon fibers textile structures, fabrics, used for combination with non-carbon fiber materials and / or materials or combinations thereof.
  • non-carbon-containing fiber materials and / or materials, fiber materials and / or materials are understood as meaning no carbon-containing organic constituent (s), which are converted by pyrolysis in graphitic carbon arranged to have.
  • Figure 1 shows various forms of carbon fiber assemblies.
  • Figure 2 shows schematically a simple embodiment of the device according to the invention.
  • Figure 3 shows schematically an inventive arrangement with a
  • FIG. 4 shows an embodiment of a removal device according to the invention.
  • FIG. 5 schematically shows an embodiment according to the invention of an application and fixing device.
  • the present invention is characterized in that a resolution and orientation of the carbon fiber worms and / or flakes 2, referred to below as flakes 2, shown in FIG. 1 takes place via a pneumatic process without damaging the carbon fibers.
  • the flakes 2, which are obtained for example from fiber composite waste 1, are fed via a feed 13 to a vortex vessel 12 shown in FIG.
  • the flakes 2 are acted upon via a compressed air nozzle 7 with an adjustable via a reducer 1 1 compressed air flow. Due to induced
  • the flakes 2 are separated into individual fibers 3 and fiber bundles 4.
  • the individual fibers 3 or separated fiber bundles 4 leave the vortex vessel 12 via the vortex container outlet 8 shown in FIG. 3. Insufficiently separated flakes 2 are prevented from leaving the vortex vessel 12 via the vortex container outlet 8 due to their size and the flow again due to the air flow of the compressed air nozzle 7 fed.
  • an alignment element 9 can be connected. This leads to a largely laminar extraction flow and optimizes the alignment of the individual fibers 3 or individual fiber bundles 4.
  • the alignment element 9 is not limited in its design to a cylindrical base body, but can also be designed to reduce the speed in a conical shape.
  • the individual fibers 3 or separated fiber bundles 4 emerging from the alignment element 9 or the vortex container outlet 8 are fed to a forming unit for forming the strip 4, as sketched in FIG.
  • This consists in the case shown of a rotating drum 16, a motor 18 and a suction 15.
  • the drum 16 is designed in a region 17 with a mesh fabric as a shell material to ensure a suction.
  • the individual fibers 3 or fiber bundles 4 are deposited on the perforated surface 17 of the drum 16 through the suction 15.
  • the acceptance unit can be designed as a suctioned conveyor belt.
  • the shaped band 5 has a high degree of orientation of the individual fibers 3 or fiber bundles 4 in the fiber longitudinal direction.
  • solidification to ensure the textile processability of the product can be achieved by applying the belt 5 with one rotation.
  • the damage-free fiber sliver 5 is applied with a suitable binder by means of a fill-in process, as outlined in FIG.
  • suitable binder for this purpose are, for example, aqueous systems, such as polyurethane dispersions, styrene-butadiene dispersions, epoxy dispersions or polyacrylate dispersions. It is also possible to use solutions such as PU-DMF solutions for binding the strip 5. Before and after dipping the strip 5, nozzles 20; 21 are used. Excess binder is squeezed off after the dipping process via a pair of rollers 24.
  • the finishing of the finished product 6 takes place on bobbins, which can then be a textile processing, for example, a surface formation on Multiaxiallegemaschinen, fed.
  • the binder content in the product 6 is essentially dependent on the parameters selected in the padding process, as exemplified in FIG. 5, especially on the chosen binder and its solution concentration. Possible binder concentrations are between 0% by weight and 99% by weight, preferably between 1% by weight and 15% by weight, ideally between 2% by weight and 8% by weight.
  • Example 1 A desized carbon fiber tangle is cut, for example, to an average length of 50 mm and submitted. An amount of 1, 00 g of carbon fibers are removed from the tangle and fed to the vortex vessel 12. The reducer 1 1 is set to 1 bar. About the compressed air nozzle 7, a turbulent flow is generated in the vortex vessel 12, whereby the submitted carbon fiber tangle is isolated. The individual fibers or fiber bundles exit the vortex container 12 via the vortex container outlet 8. The separated carbon fibers pass through the alignment element 9 to the acceptance unit, which is designed as a rotating drum 16. Due to the absau- tion speed of the drum 15 are the isolated th carbon fibers in the direction of rotation on the perforated portion 17 of the submerged drum 16 from.
  • a carbon roving 6 made of oriented fibers produced in the described manner is outstandingly suitable for textile-technical fabrication and can be further processed by known processes to form a fiber composite component.
  • the test specimens produced according to DIN EN ISO 527-5 have up to 86% of the tensile modulus of the starting material and up to 90% of the original tensile strength.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonwoven Fabrics (AREA)
  • Inorganic Fibers (AREA)

Abstract

La présente invention concerne un procédé de préparation des enchevêtrements de fibres pour la production de produits semi-finis en fibres de carbone, le procédé comprenant les étapes consistant à : a) produire des enchevêtrements de fibres contenant au moins des fibres de carbone et/ou des faisceaux de fibres de carbone dans une zone de turbulence ; b) séparer au moins partiellement les enchevêtrements de fibres dans un flux turbulent dans la zone de turbulence afin d'obtenir des fibres de carbone et/ou faisceaux de fibres de carbone séparés ; c) éventuellement cribler à l'air les fibres de carbone et/ou faisceaux de fibres de carbone séparés dans la région de turbulence afin d'obtenir des fibres de carbone et/ou faisceaux de fibres de carbone fractionnés ; d) évacuer les fibres de carbone et/ou faisceaux de fibres de carbone séparés obtenus à l'étape b) et/ou fractionnés à l'étape c) de la zone de turbulence dans une zone d'orientation, les produits semi-finis de fibres de carbone étant obtenus pendant ou après l'étape d). Le procédé de l'invention comprend en outre au moins une des étapes suivantes consistant à : e) orienter les fibres de carbone et/ou faisceaux de fibres de carbone évacués à l'étape d) dans le sens d'un écoulement laminaire dans la zone d'orientation, les fibres de carbone et/ou faisceaux de fibres de carbone étant présents en étant étirés le long de leur axe longitudinal ; f) mettre en circulation les fibres de carbone et/ou faisceaux de fibres de carbone évacués à l'étape d) et éventuellement orientés à l'étape e) dans le sens de l'écoulement laminaire ; g) déposer les fibres de carbone et/ou faisceaux de fibres de carbone évacués à l'étape d) et éventuellement orientés à l'étape e) dans le sens de l'écoulement laminaire et/ou éventuellement mis en circulation à l'étape f) sous la forme d'une bande de fibres de carbone dans une zone de dépôt.
PCT/EP2015/074822 2014-10-27 2015-10-27 Procédé et dispositif de production de produits semi-finis en fibres de carbone WO2016066621A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14190488.8 2014-10-27
EP14190488.8A EP3015576A1 (fr) 2014-10-27 2014-10-27 Procédé et dispositif de fabrication de semi-produits en fibre de carbone

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CN111542655B (zh) * 2018-01-26 2022-09-23 东丽株式会社 增强纤维束
DE102019115358A1 (de) * 2019-06-06 2020-12-10 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung und Verfahren zur Herstellung eines Vlieses sowie Anlage zur Herstellung von faserverstärkten Harzmatten

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DE2001886A1 (de) * 1969-01-17 1970-07-23 Kureha Chemical Ind Co Ltd Verfahren zum OEffnen von Fasern oder Faeden
US3975263A (en) * 1975-02-25 1976-08-17 Elo Heikki K Material separation apparatus and method
SU592879A1 (ru) * 1976-04-15 1978-02-15 Предприятие П/Я М-5409 Устройство дл разделени штапелированного углеродного волокна
WO2001068556A1 (fr) * 2000-03-16 2001-09-20 Honeywell International Inc. Procede et dispositif de fabrication de pieces composites renforcees par fibres
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